%h_set is not called wen a 1x1 handle is used, but only when a vector of
more than 2 handles is used. I suppose this mechanism is implemented i
the built-in "set" ?

My other question/remark is about the naming convention of built-in
functions like "set". When macros do exist wit the same name but in
different libraries, the library name used as a prefix plays the role
of a namespace and allows to disambiguate calls: e.g."graphicslib.plot"
vs "plolib.plot". However, there is no namespace for built-in functions.

The reason for these questions is that I am currently re-engineering the
plotlib and need a smooth mechanism to emulate new properties/fields for
*native* Scilab handles.